Comment 0 for bug 1804961

When I emulate a virt-3.0 machine, Windows 10 BSoD on boot, with the error code being ACPI_BIOS_ERROR(0x000000A5), virt-2.12 boots fine.

Windows Build: 10.0.17134.1
QEMU version: 3.0.0
Commandline: qemu-system-aarch64 -M virt -accel tcg,thread=multi -cpu cortex-a57 -smp 2 -m 2048 -bios QEMU_EFI.fd -device ramfb -device nec-usb-xhci -device usb-kbd -device usb-tablet -hda disk.vhd -vnc :0

By the way, the patch to add DBG2 table discussed here https://lists.gnu.org/archive/html/qemu-devel/2015-09/msg02550.html works (although minor change is required to adapt to the qemu 3.0.0 code), the table is accepted by Windows (Windows require both DBG2 and SPCR to be valid for serial kernel debugging to work), so it may help further diagnosing this issue.